Tom Lane 2d8d66628a Clean up plantree representation of SubPlan-s --- SubLink does not appear ...

in the planned representation of a subplan at all any more, only SubPlan.
This means subselect.c doesn't scribble on its input anymore, which seems
like a good thing; and there are no longer three different possible
interpretations of a SubLink.  Simplify node naming and improve comments
in primnodes.h.  No change to stored rules, though.

2002-12-14 00:17:59 +00:00

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